
99Potential Hybrid Methods for Oxygen Production
the low-pressure air has an oxygen concentration of
23.5%. Case 1-2 undergoes purge at 0.8bar, while Case
1-3 use a vacuum pressure of 0.6bar for purge. Case 1-1
is coupled with the PSA/TSA air prepurication unit
(shown in Figure 5.3); Cases 1-2 and 1-3 are coupled
with the two-TSA air prepurication process. Because
of its higher pressure ratio (P
H
/P
L
), Case 1-3 upgrades
the oxygen concentration more; therefore, the CZPSA
and prepurication units in Case 1-3 process less feed
compared to Cases 1-1 and 1-2. Cases 1-2 and 1-3 require
that the CZPSA unit and the piping from its outlet to
the m ...